APPARATUS FOR CONTROLLING A FUEL SYSTEM OF AN INTERNAL COMBUSTION ENGINE

摘要

A fuel system includes an electronically controllable high pressure fuel pump (22) operable to supply high pressure fuel from a lower pressure fuel source to a high pressure fuel collection chamber (34) having a pressure sensor (72). The fuel collection chamber feeds an electronically controllable valve (38) operable to dispense the high pressure fuel to a fuel distribution unit. A control computer (58) is provided for controlling the high pressure fuel pump and valve in response to requested fueling, engine speed and fuel pressure provided by the pressure sensor. In a first limp home mode, the system is operable to drive the fuel pump as a function of fuel pressure and commanded fueling if abnormal operation of the high pressure fuel pump is detected. In a second limp home mode, the system is operable to drive the fuel pump with a predicted fuel pump command based on the fuel command and engine speed, if abnormal operation of the pressure sensor is detected.